Lamp-socket.



OVERTON WINSTON, 0F MINNEAPOLIS, MINNESOTA.

Lr-socxnr.

Specication of Letters Patent. l Patented Matr'. 13 2, 1%18.

\ Application med inne 7, 191e. serial No. 102,213.

To all whom t may concern:

Be it known that I, OVERTON WIns'roN, a' citizen of the United States', residing at Minneapolis, in the county of Hennepin and v,

State of'lldinnesota, have invented certain new and useful Improvements in Lamp- Sockets; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

, illustrate the invention, like characters in- Sil dicate like parts throughout the several views. y

Referring to'the drawings:

Figure 1 is a view partly in vertical section and partly in elevation with some parts broken away, showing the improved socket and an electric light bulb held thereby; and

Fig. 2 is a view corresponding to Fig. 1, but illustrating a slightly modified construction.

ln both views, the numeral 1 indicates an electric light hulb of the single base type having on its shank a surrounding metal sleeve 2 that constitutes one ot the contacts ofthe bulb and having an axial inet-al disk 3 that constitutes the other contact of the said light bulb. rlhis light bulb is, or may be, ot the well known Ediswan type. The,

contact sleeve 2 has radially projecting lock lu ll, and is adapted to be telescoped, into a lding collar 5 that is provided with an externally/threaded eccentric 5a. The lock lugs 4 are adapted to be inserted into corresponding longitudinal internal grooves 6 of the holding collar 5 and to be turned into engagement with al corrugated internal shoulder 7 of said holding collar.

The eccentric externally threaded portion 5a of the holding collar 5 is screwed into the internally threaded portion of a socket sleeve 8, which, at its rear end, has a rigidly secured plug 9 of insulating material. vThis plug 9 as a forwardly projecting reduced hu'b or bosslO, and projecting axially therefrom, is a forwardly spring-pressed Contact plunger 11 that engages the axial contact boss 3 of the lamp shank, when the light is- The so-called collar 5 and in position. sleeve 8 constitute an adjustable lamp socket in which the sleeve 8 is the relatively ixed member and the collar the relatively adjustable member.

In the construction illustrated in Fig. 1, the holding collar 5, which is, of course, of metal, is provided at its extreme inner end with rigidly secured supplemental section in the form of a rin 12. This ring 12 adords a base otre-'action for the iront end of a coiled spring 13, the rear end of which surrounds thev boss 10 and bears against the body portion of an insulating plug 9. The said boss and the ring 12 hold the spring v13 concentric with, but spaced from the interior threaded portion of the sleeve 8.

The said spring puts the threaded engage-i ment between the eccentric and sleeve under tension, so that the eccentric isnot liable to be accidentally rotated.

1n the construction illustrated in Fig..4 2,

a tapered coiled spring 14 which performs the same function as the spring 13 in the other construction, is seated at its contracted rear end around 'the boss 10 and against the plug 9, and at its :liront end is seated directly in an annular groove 15 rormed in the inner end of the threaded eccentric 5a. ln .both arrangements, the tension springs for preventing accidental rotation of 'the eccentric and holding collar., are properly held out of engagement with the internal threads of the sleeve 8 so that it is immaterial' whether the said threads and the spring have or have not spiral travel in the same direction, since interlocking engagement between the two cannot take place. ln a lamp socket of this character, one of the leads of the circuit for supplying the lamp will be connected to the contact plunger 11 and the otherwill be connected to the sleeve 8.

at l claim is:

1n a lamp socket, the combination with an internally threaded socket sleeve and a lamp holding collar having an eccentric portion provided with external threads engaging the threads of said socket' sleeve, an insulating plug in the rear end of said socket sleeve having a forwardly projecting boss, and al In testimony wherof I aix my signature, coiled tension spring seated at its rear end in presence of two witnesses. v against said plug and aroud said boss and seated at its front end in t e eccentric portion of 4said holding sleeve and thereby held Witnesses: out of contact with the threaded inner walls CLARA DnMARnsT, f

OVERTON WINSTON of said socket sleeve. j BERNICE G. WHEEmR. 

